On Fri, 16 Feb 2007 17:44:14 -0600, you wrote: >Richard W. Solomon wrote: >> I looked at the ACE-III on Trimble and do not see mention of a 10 KHz output. >> Maybe I miised it, but without it, the N1JEZ board will not do unless you >> modify >> it for 1 pps. >> I am trying to find more info, but since it reached EOL, Trimble may have >> deleted >> it. >> >> 73, Dick, W1KSZ >Dick, > >You are correct, you need to patch another set of dividers in the chain. >Keep in mind that the only benefit of a 10 kHz output on the Jupiter is >to save 4 decade dividers. You should not use the fact that the Jupiter >outputs 10 kHz to speed up the loop in a GPSDO. The loop bandwidth is a >function of the crossover point between the VCXO and the GPS, which in >most cases will be between many minutes (cheap VCXO) and a few hours (HP >10811). Whether you use 1 Hz or 10 kHz comparison frequency into the >phase detector will not affect the filter.
Hi, (As this is my first post here, I'll try not to mess up too badly :) I think that for a simple controller like the N1JEZ board, a 10KHz output on the GPS really is needed. I tried a circuit like that with 100pps once out of curiosity, but as I remember, the lower error sensitivity made things more difficult. BTW, with a standard GPSDO, would using the 100Hz/10KHz the pulse not reduce the need for a fast comparator clock, and also reduce sawtooth effects? Angus. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts